From a8a1781b87266a1b006e2223581facd0517e555b Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=EB=82=A8=EC=98=81=EB=AF=BC?= Date: Wed, 1 Feb 2017 19:25:46 +0900 Subject: [PATCH] serial: samsung: enable clock before accessing interrupt mask resister Ensure that the uart clock is enabled prior to writing to the interrupt mask register in s3c24xx_serial_resume_noirq function. Without enabing the uart clock, the uart register cannot be accessed. Signed-off-by: Youngmin Nam Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/samsung.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c index a9b309ba24a4..b4f86c219db1 100644 --- a/drivers/tty/serial/samsung.c +++ b/drivers/tty/serial/samsung.c @@ -1916,6 +1916,7 @@ static int s3c24xx_serial_resume(struct device *dev) static int s3c24xx_serial_resume_noirq(struct device *dev) { struct uart_port *port = s3c24xx_dev_to_port(dev); + struct s3c24xx_uart_port *ourport = to_ourport(port); if (port) { /* restore IRQ mask */ @@ -1925,7 +1926,9 @@ static int s3c24xx_serial_resume_noirq(struct device *dev) uintm &= ~S3C64XX_UINTM_TXD_MSK; if (rx_enabled(port)) uintm &= ~S3C64XX_UINTM_RXD_MSK; + clk_prepare_enable(ourport->clk); wr_regl(port, S3C64XX_UINTM, uintm); + clk_disable_unprepare(ourport->clk); } }